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authorIvo van Doorn <ivdoorn@gmail.com>2008-03-09 22:44:30 +0100
committerJohn W. Linville <linville@tuxdriver.com>2008-03-13 16:02:35 -0400
commit5f46c4d0537a870f9d9c1fd998aa9d6dac682595 (patch)
tree8a745b5dd824a803a0dacc62b3433ab906a0eda9 /drivers/net/wireless/rt2x00/rt2x00debug.c
parent61191fb272dfa413763416ee828aae28bfd9746e (diff)
rt2x00: Upgrade queue->lock to use irqsave
The queue->lock could be grabbed from interrupt context, which could lead to lockdep panic like this: kernel: ====================================================== kernel: [ INFO: soft-safe -> soft-unsafe lock order detected ] kernel: 2.6.25-0.95.rc4.fc9 #1 kernel: ------------------------------------------------------ kernel: rt2500pci/1251 [HC0[0]:SC0[1]:HE1:SE0] is trying to acquire: kernel: (&queue->lock){--..}, at: [<ffffffff88213339>] rt2x00queue_get_entry+0x5a/0x81 [rt2x00lib] kernel: kernel: and this task is already holding: kernel: (_xmit_IEEE80211){-...}, at: [<ffffffff8122e9a3>] __qdisc_run+0x84/0x1a9 kernel: which would create a new lock dependency: kernel: (_xmit_IEEE80211){-...} -> (&queue->lock){--..} kernel: kernel: but this new dependency connects a soft-irq-safe lock: kernel: (_xmit_ETHER){-+..} kernel: ... which became soft-irq-safe at: kernel: [<ffffffffffffffff>] 0xffffffffffffffff kernel: kernel: to a soft-irq-unsafe lock: kernel: (&queue->lock){--..} kernel: ... which became soft-irq-unsafe at: kernel: ... [<ffffffff810545a2>] __lock_acquire+0x62d/0xd63 kernel: [<ffffffff81054d36>] lock_acquire+0x5e/0x78 kernel: [<ffffffff812a1497>] _spin_lock+0x26/0x53 kernel: [<ffffffff88212f98>] rt2x00queue_reset+0x16/0x40 [rt2x00lib] kernel: [<ffffffff88212fd4>] rt2x00queue_alloc_entries+0x12/0xab [rt2x00lib] kernel: [<ffffffff88213091>] rt2x00queue_initialize+0x24/0xf2 [rt2x00lib] kernel: [<ffffffff88212036>] rt2x00lib_start+0x3b/0xd4 [rt2x00lib] kernel: [<ffffffff88212609>] rt2x00mac_start+0x18/0x1a [rt2x00lib] kernel: [<ffffffff881b9a4b>] ieee80211_open+0x1f3/0x46d [mac80211] kernel: [<ffffffff8121d980>] dev_open+0x4d/0x8b kernel: [<ffffffff8121d41e>] dev_change_flags+0xaf/0x172 kernel: [<ffffffff81224fc2>] do_setlink+0x276/0x338 kernel: [<ffffffff81225198>] rtnl_setlink+0x114/0x116 kernel: [<ffffffff812262fc>] rtnetlink_rcv_msg+0x1d8/0x1f9 kernel: [<ffffffff8123649a>] netlink_rcv_skb+0x3e/0xac kernel: [<ffffffff8122611a>] rtnetlink_rcv+0x29/0x33 kernel: [<ffffffff81235eed>] netlink_unicast+0x1fe/0x26b kernel: [<ffffffff81236224>] netlink_sendmsg+0x2ca/0x2dd kernel: [<ffffffff812103b3>] sock_sendmsg+0xfd/0x120 kernel: [<ffffffff812105a8>] sys_sendmsg+0x1d2/0x23c kernel: [<ffffffff8100c1c7>] tracesys+0xdc/0xe1 kernel: [<ffffffffffffffff>] 0xffffffffffffffff This can be fixed by using the irqsave/irqrestore versions during the queue->lock handling. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00debug.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00debug.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00debug.c b/drivers/net/wireless/rt2x00/rt2x00debug.c
index 21af11a9733..bfab3b8780d 100644
--- a/drivers/net/wireless/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/rt2x00/rt2x00debug.c
@@ -278,6 +278,7 @@ static ssize_t rt2x00debug_read_queue_stats(struct file *file,
{
struct rt2x00debug_intf *intf = file->private_data;
struct data_queue *queue;
+ unsigned long irqflags;
unsigned int lines = 1 + intf->rt2x00dev->data_queues;
size_t size;
char *data;
@@ -294,7 +295,7 @@ static ssize_t rt2x00debug_read_queue_stats(struct file *file,
sprintf(data, "qid\tcount\tlimit\tlength\tindex\tdone\tcrypto\n");
queue_for_each(intf->rt2x00dev, queue) {
- spin_lock(&queue->lock);
+ spin_lock_irqsave(&queue->lock, irqflags);
temp += sprintf(temp, "%d\t%d\t%d\t%d\t%d\t%d\t%d\n", queue->qid,
queue->count, queue->limit, queue->length,
@@ -302,7 +303,7 @@ static ssize_t rt2x00debug_read_queue_stats(struct file *file,
queue->index[Q_INDEX_DONE],
queue->index[Q_INDEX_CRYPTO]);
- spin_unlock(&queue->lock);
+ spin_unlock_irqrestore(&queue->lock, irqflags);
}
size = strlen(data);